Primer for liquid-air cartridges



Dec. 2, 1924. 1,517,295

A. KOWASTCH PRIMER FOR LIQUID AIR CARTRIDGES Filed July 19. 1920 WMW M= ES rwe/wtm-. W awa /14571 Patented Dec. 2, 1924.

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PRIMER FOR LIQUID-AIR CARTRIDGES.

Application filed July 19, 1920. Serial No. 397,558

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT. L., 1313.)

To all whom 2'2. may concern:

Be it known that I, AMBROSE KoWAs'roH, of Berlin-Charlottenburg, Leibnizstr. 78,. Germany, have invented a certain new and useful Primer forLiquid-Air Cartridges, of which the following is a specification.

lhe present invention relates to a fuse or an ignitor and a method of ignition for blasting charges, when employing liquefied gases. The invention consists first, in saturating the fuse or ignitor with or without a cartridge in immediate proximity, or in front of the bore-hole, in order to bring about and to increase the initial efi'ect, secondly, in order to obtain a stronger and more intense blasting effect, in making the tube of the igniting device of a case or shell of a solid and resistant material, and in providing it with one or several apertures or holes, whereby an ordinary fuse or ignitor, or like priming composition, may be combined with a fuse saturated with liquefied gases. In case the ignitor is saturated inside the borehole, the less skillful workman or miner may happen to fail in introducing and supplying the liquefied gases in such a faultless way to answer all the requirements of a perfect practice. By the present improved method, however, the way of saturating or impregnating the ignitor or priming composition is considerably quicker, safer and more reliable, and in the preparing and finishing of the blasting charge or the cartridge when they are saturated outside the borehole, is much easier and more simple. Outside the borehole the cartridges without the well known fuse of fulminating mercury, or some similar ignitor, are less dangerous in themselves, and can be more easily handled. All these advantages mentioned above, are gained by saturating the ignitor or primer with or without a cartridge, outside the borehole. How long and strong the walls of the case or shell of the ignitor or detonating tube must be, will depend entirely on the greater or smaller blasting or bursting properties of the cartridge and must be made accordingl It will, therefore, answer the purpose best to use iron or any similar solid and resistant material for the tube or shell, and provide its wall with holes or apertures, to

admit the liquefied gases, or facilitate their entrance or else leave the longitudinal sea-m of the tube open, but in such a way that the contents cannot possibly drop out. Owing to the resistance offered by the solid tough metal, or any similar strong material, the pressure inside the shell can be raised correspondingly, and thus the explosive effect will be increased and enhanced. It is of no importance, whether the igniting contrivance is with or without a cartridge when it gets saturated or soaked.

In the accompanying drawing forming a part of this specification the invention is shown by way of two examples.

F 1 represents an igniter or primer for liquid air.

Fig. 2 the combination of a liquid air igniter or igniting cap with an ordinary igniter.

It quite depends upon the requirements of the practical case in question, whether, a fuse or an ignitor which has not been saturated with a liquefied gas, or also a combination of such a fuse with an ignitor that is saturated with liquid oxygen, may be employed to bring about and realize a better and more eifective blasting result, and to act as a compensation for eventually too strong an evaporation of the liquid gas fuse.

According to Fig. 1 in the igniting cap a a carbon carrier 6 is inserted.

The wall of the cap a is easily pervious for the admittance of the liquefied gases so as to impregnate with the same the carbon carrier 6. The ignition can be effected either electrically or by means of a quick match.

In the form of execution shown in Fig. 2 (Z is an ordinary or ready made igniter or primer which can be used without impregnating with a liquefied gas. This primer cl is brought in connection with an igniter e or an igniting cap, which is to be saturated with a liquefied gas.

The ignition is effected by electric igniting wires f or by quick-match.

An igniting cap is in many cases preferable to an igniter proper as the latter does not properly oppose cooling down so that it fails or misses fire.

As for the material of the tube or shell of the igniting fuse, it may be chosen in such a manner and of such a kind that, When a loss of oxygen takes place after a certain specified time the priming composition Wlll no longer be able to transmit the ignition.

This circumstance or desired efiect, can be regulated by the relative thickness of the material selected.

In most cases, in order to keep'the priming composition that is soaked with liquefied gases for a. longer time efiective it will be advisable to perform the impregnating process in such a Way that an excess or 'su'rplus'quantity of liquefied gases is absorbed. This surplus quantity will also "replace the eventual losses caused by evaporation.

Having thus described 'my invention; What combining an ordinary ignitor or fuse with another ignitor or primer, or enriched primingdevice Which are respectively saturated with liquefied gases. 7 In testimony whereof I affixed my signature in presence of two witnesses.

AM'BROSE KOl VA STCH.

Witnesses:

PETER MEFFERT, FRITZ THRUDMERZ. 

